推荐系统实战（6）——评估

一、打分系统-评分偏差率 def RMSE（records）: return math.sqrt(sum([(rui-pui)*(rui-pui) for u,i,rui,pui in records])/float(len(records))) def MAE(records): return sum([abs(rui-pui) for u,i,rui,pui in record

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